The Second World War began when Germany
invaded Poland on 1 September 1939. Britain and France had pledged to defend
Poland. On 3 September the French and the British governments declared war on
Germany. The French and the British could do very little to stop a German
victory in Poland. By the end of the month, Polish resistance had collapsed.

On 17 September Soviet forces crossed the
Polish frontier and took control of part of eastern Poland. This was part of the
deal Hitler had struck with Stalin before the war in the Nazi-Soviet Pact.
Stalin also moved his troops into the Baltic states of Latvia, Lithuania and
Estonia.

In Poland and each of the following campaigns
Hitler's methods became known as a 'Blitzkrieg' or lightning war. Blitzkrieg
involved the use of overwhelming force, in as short a time as possible, in
order to crush the enemy. Extensive use was made of tanks and other armored
vehicles. The Germans had much success with this technique.

The phoney war

Having succeeded in the east, Hitler's
thoughts turned west. He began to make plans for an attack on France. Meanwhile
the British and the French tried to weaken Germany by stopping German trade by
sea. In particular they tried to cut off the supply of iron ore from
Scandinavia. From October 1939 to April 1940 there was little fighting between
Britain, France and Germany. This period became known as the 'phoney war'.

Fighting did take place in the winter of
1939-40 between the USSR and the small Baltic state of Finland. The Finnish
army fought with great skill and ferocity and it took from October 1939 to
March 1940 for the USSR to defeat her small neighbor. Eventually Finland was
defeated and forced to give territory and a naval base to the USSR. The Soviet
struggle to defeat Finland convinced Hitler that the Red Army could easily be
beaten by Germany. His secret long-term plan was to turn against the Soviet
Union and set up a new German empire in the east.

In April 1940 the French and the British started
mining Norwegian waters to stop the trade in iron ore. Germany responded by
invading Norway and Denmark. The fall of Finland, Norway and Denmark led to a
political crisis in Britain and France. Both prime ministers were forced to
resign. In Britain Winston Churchill came to power in May 1940.

The Fall of France

After months of waiting Hitler struck west in
May 1940. The Netherlands, Belgium and France were invaded and rapidly defeated
by German forces. A British army was forced to flee from the continent back to
Britain from the port of Dunkirk. Germany took direct control of much of
France. Leaving part of the south and south-east of the country under a puppet
French government, with its capital in the town of Vichy.

At this point it seemed that Hitler had
virtually won the war. France was beaten and much of Europe was occupied. Only
Britain remained to fight Germany. Sensing that the war was nearly over
Mussolini joined forces with Germany in June 1940. He wanted Italy to get some
of the rewards of victory.

Having defeated France, Hitler prepared for a
German invasion of Britain. The German airforce, the Luftwaffe, set out to win
control of the air over Britain. This was the first stage of the invasion plan.
German planes bombed military sites, factories and the capital city, London, in
August and September 1940. The British airforce, the RAF, fought back and the
clash of the two airforces became known as the Battle of Britain.

Although there were heavy losses on both
sides, the RAF got the upper hand in the Battle of Britain and as a result
Hitler was forced to put off his plans for an invasion of Britain.

The Italian attempt to share in Hitler's
victory went disastrously wrong. An Italian army was defeated by Britain in
North Africa, and Greece successfully stopped an Italian attempt to invade.
Hitler was obliged to send German forces to north Africa and to Greece in order
to help his ally.

Hitler turns east

One of the great turning points of the war
took place on 22 June 1941 when Germany invaded the Soviet Union in an
operation known to the German leaders as Barbarossa. At first, the blitzkrieg
approach was successful for Germany. An army of over 3 million men stormed into
the USSR, armed with over 3,000 tanks and 5,000 aircraft. Stalin was taken
completely by surprise. German forces penetrated deep inside the Soviet Union
capturing key cities such as Smolensk and Kiev.

By mid-October over 3 million Soviet troops
had been captured and the Germans were moving in on Moscow. At this point the
campaign began to go wrong for Hitler. The German army reached the suburbs of
the Soviet capital but met with fierce resistance and failed to capture the
city. German troops were not equipped for the freezing Russian winter because
Hitler thought that the war would be over in three months.

America joins the war: the attack on Pearl
Harbor

While the battle for Moscow raged, the most
powerful country in the world, the USA, became involved in the war. On 7
December 1941 the Japanese went to war against the USA with a surprise attack
on the US naval base of Pearl Harbor. The result of this was that the USA
joined forces with Britain and the USSR to fight Germany, Japan and Italy. In
the end this was to swing the balance of the war decisively against Germany. At
first Japan was all-conquering and in the early months of 1942 Japanese forces
seized control of much of Eastern Asia and the islands of the Pacific.

The tide turns

In the summer of 1942 the Germans renewed
their attack on the USSR. They concentrated their forces in the south and tried
to capture the southern city of Stalingrad. A fierce battle for the control of
the city was fought in the autumn of 1942. The Soviet forces launched a
counter-attack in November and the German army was eventually surrounded.

At the end of January 1943 the German army at
Stalingrad surrendered. The battle for Stalingrad was a crucial event. It
proved that the Red Army could beat the German army. After Stalingrad, Germany
was on the defensive and the war began to go against Hitler.

There were further decisive battles in 1942.
In June the USA stopped the tide of Japanese conquest at the Battle of Midway
Island. After Midway, American forces began a slow process of capturing the
islands of the Pacific from the Japanese. In October 1942 the German army in
north Africa was defeated by British forces at the Battle of El Alamein. By May
1943 the Germans and Italians had been completely driven out of north Africa.

The Holocaust

Both the Germans and the Japanese treated many
of their prisoners with extreme brutality. The most horrific atrocity of the war
was the way millions of Jewish civilians were systematically murdered in
Europe. This act is now known as the Holocaust. As German forces captured
territory in Eastern Europe, special army units massacred local Jews and other
groups disliked by the Nazi Germans.

In July 1941 the German leadership decided on
a 'Final Solution' to the question of how Jewish people should be treated by
the Nazi authorities. Death camps were set up to exterminate the Jewish
population. Many were gassed to death: others were used as slave labor until
they died. There can be no doubt that Hitler personally approved the decision.

The end game

After the decisive battles of 1942 the war
went against Hitler and his allies. However, progress was slow:

• British and American forces landed in Italy
in 1943. The Germans put up stiff resistance to the liberation of Italy. Rome
was taken in June 1944 but it was not until 1945 that the whole of Italy was
under British and American control.

• In January 1944 the Germans abandoned the
siege of Leningrad, which had been going on for over two years. By the summer
of 1944 the Germans were in retreat across the Soviet Union.

• France was invaded on 6 June 1944. This was
known as 'D Day'. By 25 August the British and American forces had reached
Paris. The Germans launched a counter-attack in December 1944 in the Ardennes
area of Belgium. After some early success the German attack was turned back.

• The USA liberated territories in the Pacific
were taken by Japan. The Japanese forces put up ferocious resistance at every
stage. In October 1944 the Americans invaded the Philippines. Over 170,000
Japanese soldiers were killed before the capital, Manila, was taken.

German power in Europe finally collapsed in
April 1945. Soviet forces captured Berlin and Hitler committed suicide. The
German forces finally surrendered on 8 May 1945 but the war continued against
Japan. The American government was very worried at the level of Japanese
resistance. The Americans expected a huge loss of life if they invaded and
tried to conquer the islands of Japan.

American scientists had been working for some
years on the development of a new kind of weapon - the immensely powerful
atomic bomb. In August 1945 two atomic bombs were dropped on the Japanese
cities of Hiroshima and Nagasaki. The devastation caused by these bombs forced
the Japanese government to surrender on 14 August 1945. The Second World War
was over.